Since Doosan Infracore started making diesel engines in 1958, the company has continued to manufacture its R&D capacities to stay at the forefront of the industry in Korea. In 1975, Doosan began mass producing diesel engines at its first large-scale plant. Within a decade the production technology of the company had progressed to the point that producing its very own diesel engine model was possible. Doosan's leadership position in the industry was secured. In the year 1995 Doosan made its first low-emission diesel engine, followed by commercial vehicle CNG engines after three years. Since the year 2000, the company has developed technology for low-pressure natural gas engines, sophisticated common-rail engines, and Tier 3-compliant engines. In order to follow strict Euro emission control standards, the company developed a heavy-duty, low emission diesel engine model in 2007.
Doosan Infracore has facilities worldwide to manufacture 60 different kinds of engines, as well as materials and parts. Products consist of natural gas engines and diesel engines for forklifts, trucks, construction equipment, buses, ships, generators and more. Engines vary from 70 to 1,500 hp. Yearly output is presently 75,000 units.
The company is continually engaged in expanding R&D capabilities to expand to more markets and increase output. Demand for stricter regulations governing engine emissions has led the company to build a compressed natural gas engine factory in the United States in 2008, and a joint venture factory in Xuzhou, China. The plant within China would have the capacity to manufacture 50,000 diesel engines on an annual basis, with production scheduled to begin in 2011.